14 Papers
236 Citations
R. Ellis is an academic researcher from Lawrence Livermore National Laboratory. The author has contributed to research in topics: Divertor & Tokamak. The author has an hindex of 8, co-authored 13 publications.
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Papers
A tangentially viewing visible TV system for the DIII-D divertor
TL;DR: In this article, a video camera system was installed on the DIII-D tokamak for two-dimensional spatial studies of line emission in the lower divertor region, where the system views the divertor tangentially at approximately the height of the X point through an outer port.
Motional Stark effect diagnostic expansion on DIII-D for enhanced current and Er profile measurements
C. T. Holcomb,M. A. Makowski,R. J. Jayakumar,S. A. Allen,R. Ellis,R. Geer,D. Behne,K. Morris,L. G. Seppala,J.M. Moller +9 more
TL;DR: The motional Stark effect (MSE) diagnostic on DIII-D has been expanded to take advantage of a change in the neutral beam geometry, adding 24 new MSE channels viewing a beam injected counter to the plasma current as discussed by the authors.
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13C transport studies in L-mode divertor plasmas on DIII-D
S.L. Allen,William R. Wampler,Adam McLean,D.G. Whyte,W.P. West,P.C. Stangeby,N.H. Brooks,D.L. Rudakov,V. Phillips,Marek Rubel,G. F. Matthews,A. Nagy,R. Ellis,A.S. Bozek +13 more
TL;DR: In this article, a toroidally-symmetric gas system was used to inject CH4-C-13 into 22 identical lower single-null L-mode discharges on DIII-D. The injection level was adjusted so that it did not significantly per...
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Studies of high-δ (baffled) and low-δ (open) pumped divertor operation on DIII-D
S.L. Allen,S.L. Allen,Max E. Fenstermacher,C. M. Greenfield,A.W. Hyatt,Rajesh Maingi,G.D. Porter,M. R. Wade,A.S. Bozek,R. Ellis,D. N. Hill,M.A. Hollerbach,C.J. Lasnier,Anthony Leonard,M.A. Mahdavi,D. G. Nilson,T.W. Petrie,M.J. Schaffer,J. Smith,R.D. Stambaugh,Daniel Thomas,J.G. Watkins,W.P. West,D. G. Whyte,R. D. Wood +24 more
TL;DR: In this paper, the Radiative Divertor Project-outer baCe (RDP-OB) and cryopump were used in both upper single null (USN) and double null (DN) ELMing H-mode discharges.
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Doppler coherence imaging and tomography of flows in tokamak plasmas (invited)a)
Jonathon Howard,Ahmed Diallo,M. Creese,B. D. Blackwell,S.L. Allen,R. Ellis,G.D. Porter,W.H. Meyer,M.E. Fenstermacher,N.H. Brooks,M. E. Van Zeeland,R. L. Boivin +11 more
TL;DR: The results of spatial heterodyne Doppler "coherence imaging" of carbon ion flows in the divertor region of the DIII-D tokamak are described and the reconstructed parallel flow field amplitudes are found to be in reasonable agreement with UEDGE modeling.